Method of and apparatus for producing bimetallic strips



Jan Vaya/m 44%/ BY 676mg m, m Q m E J. V. O. PALM ET AL, METHOD OF AND APPARATUS FOR PRODUCING BIMETALLIG STR-IPS Filed March 3, 1953 .Patented Apr. 24, 1934 y y METHOD OF AND APPARATUS FOR PRO- l DUCING BIMETALLIC STRIPS John V. 0. Palm and George S. Salzman, Cleveland Heights, Ohio, assignors to The Clevelandl Graphite Bronze Company, Cleveland, Ohio, a corporation of Ohio Application March 3, 1933, Serial No. 659,478

6 Claims. (Cl. 29-33) The present invention relating, as indicated, to part of the upper portion only of the steel strip a method of an apparatus for producing bi-mel. The strip 1 as it issues fromthe chamber 2 tallic strip, is more particularly directed to an imis provided with a coating 3 of babbitt which may proved method and apparatus for the manufacbe solidified by any suitable means to produce 5 ture of a bi-metallic strip consisting of two disa bi-metallic strip 4 of steel and babbitt. This similar metals and to the production of a strip strip is then passed 'through a brake or a drag of this character to accurate and predetermined consisting of shoes 5 and springs 6 which` exert dimensions. In the manufacture of bi-metallic a resistance to movement of the bi-metallic strip. strip of the type in which a layer of a metal such The strip passes from the drag described over a as steel is coated with a layer of a softer material supporting roll 7 and beneath a milling roll or o5 such as a bearing metal for subsequent manufaccutter 8, then over a second supporting roll 9 ture into bearings, it is very ydesirable that not and' a second milling roll 10 and then through only the supporting metal, that is, the steel, but pulling rolls l1 after which the bi-metallic strip also the bearing metal be accurately finished to is' Wound into a coil l12 for storage and subseexact and predetermined limitsI in order to inquent use. 70 sure accurate final articles and one in which the I The bi-metallic strip as it issues from the layer or coating of bearing metal will be of unimolten babbitt chamber is in the form illusform thickness. This has been dilcult to actrated in Fig. 2 in which the babbitt 3 is concomplish and has resulted in past processes in fined to the central portion of the steel strip 1,

the production of excessive amounts of scrap. the edges 13 of the strip having been blanked oi 75 Our present invention makes it possible to during the passage of the strip through the provide a bl-metallic strip of exact and predebath to prevent leakage of the babbitt around termined dimensions. T o the accomplishment the edges of the strip and between the bottom of the foregoing and related ends, said invention, of the strip and the supporting bottom of the` then, consists of the means hereinafter fully dechamber Z. The babbitt on the strip at this 80 scribed and particularly pointed out in the claims, stage is slightly thicker than the required coatthe annexed drawing and the following descriping and while the steel strip is ordinarily fairly tion settng forth in detail certain means and accurate in thickness and uniform in contour one mode of carrying out the invention, such it is sometimes slightly concave and is also very disclosed means and mode illustrating, however, vSlightly warped by reason 0f the heating in but one of various ways in which the principle the babbitt chamber. It is impossible to accuof the invention may be used. rately machine the babbitt coating to produce a In said annexed drawing: uniform thickness unless the irregularities in Fig, 1 is a side elevation more or 1ess diagramthe steel are removed or compensated for, and

matic in character illustrating an apparatus as these irregularities are not uniform they .can- 90 adapted to carry out the steps of our improved not of course be compensated for even if this method; Figs. 2, 3 and 4 are sections on the unes were a comercial Operation- We have found,

2 2, 3 3, and 4 4re5pectivelyhowever, that by placing the composite strip It will be understood that the use of the term under a heavy tehSiOn the ,irregularities in the steel in the following description and claims Strip Gah be smoothed Oil'6 and that the COS'ltIlg 95 denotes any suitable metal employed as the back- 0f bahbltt Cgh be mahlned, Whlle the Stm', l1S ing or reenforcing strip of the bi-metallic element in 15h15 Condltlon, to an accurate finish and to to be produced and of course other materials an accurate and predetermmed thlckness. We such, for example, as bronze and similar metals accomplish this by Placing the Composite Strip may for certain purposes be substituted as a reunder Severe tension Produced by the drag 5 and 100 enforcing moral. similarly, the term bearing the pulling rolls 11 and causing the strip at the metal or babbitt as hereinafter used is insame time to be bent out of its normal position tended to refer to any suitable metal softer than by passage over the supporting T0115 7 and 9. the reenforcing or backing metal and having a, The cutter 8 takes a roughing cut from the surf lower melting point. face ofthe babbitt while the cutter 10 completes 105 Referring now to Fig. l, we have shown a steel the operation, .each cutter removing but very strip 1 which isvpassed through a chamber 2 in little stock and producing an extremely accurate which there is maintained a bath of molten baband smooth surface and at the same time probitt which is maintained in contact with the viding a uniform thickness of babbitt coating on upper portion and preferably a predetermined the steel. We have found it necessary to em- 110 Cil ploy a severe tension on the strip which of course -must be varied, depending upon the thickness,

invention may be employed instead of the onev explained, change being made as regards the means and the steps herein disclosed, providedthose stated by any of the following claims or their equivalent be employed.

We therefore particularly point out and distinctly claim as our invention:-

1. In a method of making bi-metallic strip,

Y' the steps which consist in integrally uniting a coating of bearing metal to one surface of a strip of steel, converting the steel strip to a substantially fiat level condition and simultaneously removing part of the coating applied thereto.

.2. In a method of making bi-metallic strip, the steps which consist in bonding a coating of bearing metal to one surface of a strip of steel. tensioning the composite strip'thus formed to a substantially fiat level condition and then removing a predetermined portion of the bearing metal coating from the tensioned strip.

3. In apparatusA of the character described, the combination of means adapted to engage a bi-xnetallic strip at spaced points longitudinally thereof to move said strip, and simultaneously subject the same to flattening tension, and cutting means disposed between said first-named tensioning means, said cutting means being adapted to successively condition one surface of the tensioned portion of said strip.

4. In apparatus of the character described, the combination of means adapted to engage a bi-metallic strip at points spaced longitudinally thereof, said means being adapted to progressively move said strip longitudinally and simultaneously subject the same to flattening tension, and cutting means disposed between said first-named tensioning means and adapted to machine one surface of the tensioned portion of said strip.

5. In apparatus of the character described, the combination of retarding means adapted to engage a bi-metallic strip. pulling means also adapted to engage a bi-metallic strip at a mim;`

spaced from said retarding means for moving such strip longitudinally, said pulling and retarding means being conjointly adapted to exert a flattening tension on a composite strip engaged thereby, and means adapted to remove material to a predetermined point along one surface of such strip while the latter is subjected to such attening tension.

6. In apparatus of the character described, the combination of retarding means adapted to engage a bimetallic strip passing therebetween. pulling means also adapted to engage a bi-metallic strip and move lthe same longitudinally against the action of said retarding means, said retarding and pulling means being conjointly adapted to exert a attening tension on such composite strip, and means engaging one surface of said strip at a point intermediate said retarding and pulling means to angularly bend said strip and other means adapted to machine the surface of said strip opposite to said lastnamed means at such point of bend.

JOHN V. O. PALM. GEORGE S. SALZMAN. 

